Characterization of polyfunctional alkoxysilanes using potassium (K+) ionization of desorbed species mass spectrometry
摘要:
Potassium ionization of desorbed species (K+IDS) mass spectrometry has been used to characterize polyfunctional alkoxysilanes and the modes of reaction for 'star gel' precursors and simpler tetraalkoxysilanes. Efficient observation of molecular ions enabled by K+IDS can readily establish the purity of molecules such as Si(CH2CH2Si(OEt)(3))(4) and cyclo-(Me(CH2CH2Si(OEt)(3))(4)SiO)(4), and has been highly useful in determining the extent of intramolecular condensation in the star molecules. K+IDS has also established the distributions of polysilicate species and the presence of important reactive intermediates containing SiOOCH groups when Si(OMe)(4) reacts with formic acid.